How to Use
- Upload AMR: Drag and drop your `.amr` file or click the button to browse.
- Choose Cover: Upload a custom cover image or let the browser draw a solid black background.
- Trigger Conversion: Click convert to execute the in-browser compiler.
- Download MP4: Save the file to your device.
Core Features
- 100% Local Privacy: The conversion runs entirely within your browser's WebAssembly sandbox. Your audio tracks and recorded drafts are never uploaded online.
- Dynamic Conversion: Combines your AMR audio with a static cover image (or auto-generates a solid black cover) into a compliant MP4 container.
- No Bandwidth Constraints: Avoid slow upload queues. Heavy files transcode locally, utilizing your hardware's full rendering potential.
- Free & Unlimited: Convert multiple files without paywall limits.
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Calculation Logic
This tool compiles an audio file and an image file into a standard MP4 video locally. It loads FFmpeg compiled into WebAssembly, running the muxing process inside your browser sandbox to ensure speed, privacy, and audio quality preservation.
FAQ
Will my sound quality be degraded?
No. The audio encoding matches standard specifications, preserving the raw details of your input AMR file.